Allen-Bradley 809S-CT3 current transformer (NSNBC01) is a 5 A secondary device designed to be used with the 809S MachineAlert current relay system for motor protection. It provides a trip current range of 42–500 A, a continuous current rating of 750 A, and an inrush capability of 3,500 A, supporting startup surges typical in industrial motors. This transformer is intended as an accessory for Rockwell Automation's 809S protection lineup and pairs with the 809S-C1 current relay to deliver external current sensing for protective monitoring in industrial drive systems.
